\begin{table}%t1
\caption{Peaks present in the spectra before the HF treatment.}\label{preHF}
%%\begin{center}
\par
{
\begin{tabular}{cccc}
\hline\hline
Peak position  & Vibration mode &   Carrier & Interpretation  \\
(cm$^{-1}$) & & & \\
\hline
794$-$780 & Si-O-Si bending & silicate & phyllosilicate    \\
806$-$800 & Si-O-Si bending & siloxane &  remaining  silicone oil$^{a}$  \\
840$-$837 & Si-O stretching & silicate & olivine$^{a}$ \\
890$-$880 & " & silicate & olivine$^{a}$ \\
955$-$950 & Si-O stretching & silicate & pyroxene$^{a}$ \\
990$-$970 & " & silicate & olivine$^{a}$  \\
1014$-$1010 & " & silicate & pyroxene$^{a}$ \\
1018 & " & silicate & phyllosilicate$^{a}$ \\
1070$-$1060 & Si-O stretching & silicate & pyroxene$^{a}$ \\
1095$-$1080 & Si-O stretching & siloxane & remaining  silicone oil$^{a}$ \\
1260 & Si-O stretching & siloxane & remaining  silicone oil$^{a}$ \\
1375 &  COO$^{-}$ sym stretch & organic & carbox. acid salts \\
1415$-$1400 & & & unknown \\
1457$-$1450 & CO$_{3}^{-}$ &  carbonate ion & carbonates \\
1583 & COO$^{-}$ antisym stretch & organic & carbox. acid salts \\
1667$-$1660 & H-O-H bending & water & phyllosilicate \\
3000$-$2800 & CH$_{2}$; CH$_{3}$ sym and asym stretch & organic & aliphatic hydrocarbons$^{a}$ \\
2963 & Si-O stretching & siloxane & remaining  silicone oil$^{a}$ \\
3600$-$3100 (centered at 3400) & OH stretch & water  &  water in phyllosil., carbox. acids, alcohols    \\ \hline
\end{tabular}}
\parbox{16.5cm}{
$^{a}$ Unambiguous assignment.}
%%\end{center}
\end{table}